An unused flue can be draughty and allow rain to enter the stack. If you have no intention
of using the fire place and chimney facility, it is possible to seal the flue. However care
must be taken to allow ventilation inside the stack to keep it dry and avoid a build up of
dampness due to possible condensation.
There are two main methods to seal the flue correctly:
Ventilator caps
There are two types of ventilator caps available. There is a metal cap, which clips into
the chimney top. This is a very simple ventilator to fit. The second type is made of clay.
This type needs mortar to set it in position in the chimney pot.
Use of airbricks
Alternatively, remove the pots and remove a brick from both sides of the stack. They should
be removed on opposite sides, as they will then be replaced with airbricks, which will allow
the air to pass through freely.
